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yes there are protocolsHi,
if you copy any forum topic URL and try to share with friends they literally can't open it.
It just shows:
I did some Google'ing. It's probably because when pasting URL to browser there is no "Referrer" header and you added a rule so that header must be present (but it doesn't make sense since it's not possible to share any URLs now). That rule should be deleted.
You can try to it yourself. Just copy any topic URL and paste in a new tab. It's not opening.